Honestly, Dragon probably deserves respect for the dedication like Ebihara said, but then again, sorry Dragon you also did sorta turn yourself into meme material.
Dragon and Void (and indirectly Lies as well) are right, even in real life polyamory and polygamy can exist both ways (polyandry and polygyny)
Ultimately, I think Dragon might like these:
en.wikipedia.org
en.wikipedia.org
en.wikipedia.org
en.wikipedia.org
More types of relationships can be found in the opening/introductory sections of these (particularly in the Love and Relationships section in Romance) cause if I linked all of them it'd probably be too many:
en.wikipedia.org
en.wikipedia.org
Also, PedjaTarzan, no, self-pleasure is incapable of replicating the pleasure of a fulfilling relationship, unless you do these:
en.wikipedia.org
en.wikipedia.org
(though then again... probably worth considering if that would still hold true if you were a hermaphrodite/intersex individual with both sets of reproductive systems fully functioning)
en.wikipedia.org
en.wikipedia.org
Personally, while I am at times curious of how polyamory and polygamy work and whether I would ever try that sort of relationship (between either a group of 4 people consisting of 2 cis or trans males and 2 cis or trans females including myself or 4 genderfluid nonbinary peeps including myself), I'd agree with Ebihara when it comes to preferring/settling on monogamy as my main desired type/form of relationship, mostly cause it just feels like it's the most sustainable/easy-to-maintain type/form of relationship, though it does depend on a lot of stuff like culture and individual desire and whatnot.